The answer is actually quite simple. When you towel off, your body sheds thousands of dead skin cells. These skin cells cling to your towel and then bacteria does it’s thing with the dead skin cells. Eventually, your towel becomes something quite disgusting. So either wash your towel frequently, or scrub your skin raw in the tub trying to remove all the dead skin cells. This messages has been brought to you by the letter K.
Sketches From Memory 
The answer is actually quite simple. When you towel off, your body sheds thousands of dead skin cells. These skin cells cling to your towel and then bacteria does it’s thing with the dead skin cells. Eventually, your towel becomes something quite disgusting. So either wash your towel frequently, or scrub your skin raw in the tub trying to remove all the dead skin cells. This messages has been brought to you by the letter K.
Oh, sure, bring *science* into it.
Nice
I have wondered the same thing.